Cooling fans not working properly?

RICKY JUVINALL

MEMBER
2004 BUICK RENDEZVOUS
3.4L
V6
4WD
AUTOMATIC
175,502 MILES

My fans are not working but if I disconnect the temperature sending unit they work just fine.

Saturday, November 9th, 2024 AT 8:39 AM

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,602 POSTS

Usually this will be a bad engine coolant temperature sensor. Here is the location and how to change it out so we can be on the same page. Check out the images (below). Please let us know what happens.

Image (Click to make bigger)

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

Saturday, November 9th, 2024 AT 11:57 AM

RICKY JUVINALL

MEMBER
1 POST

I put the new temperature sending unit in and it's still overheating, it did not fix the problem. Could you please let me know what may be going on? Thank you, have a nice day, bye.

Was this

answer

helpful?

Yes

No

Wednesday, November 13th, 2024 AT 7:02 PM

KEN L

MASTER CERTIFIED MECHANIC
47,602 POSTS

So, the engine overheats while the cooling fan are running? I have seen a stuck thermostat cause this issue. Here is a guide to go over to help understand what's going on and I have included how to change the thermostat out. Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with.

Images (Click to make bigger)

Was this

answer

helpful?

Yes

No

Thursday, November 14th, 2024 AT 10:07 AM

RICKY JUVINALL

MEMBER
1 POST

I'm sorry I put the temperature sending unit in and the fans are still not coming on. When I take the temperature sending unit plug off, they come on but when I put it back on, they don't stay on they quit running.

Was this

answer

helpful?

Yes

No

Thursday, November 14th, 2024 AT 3:37 PM

KEN L

MASTER CERTIFIED MECHANIC
47,602 POSTS

You may have a PCM that is going out, to be sure let's use a scanner to see what the PCM is reading for the engine coolant temperature.

This guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please go over this guide and get back to us.